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[구조강도부문] 유한요소 극한해석을 이용한 사각튜브의 축방향 붕괴거동해석
김현석(H.S.Kim),허훈(H.Huh) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is concerned with numerical simulation of plastic collapse behavior of square boxes. The finite element limit analysis program was established using shell element. The simulation incorporates with finite element limit analysis based on the upper bound method and the minimization technique. The simulation is performed with various height to side length ratios (h/b) with fixed thickness to side length ratio (t/b). The numerical simulation results are compared with experiments, and it shows good agreement in collapse load and collapse mode.
피드포워드와 피드백 기법을 이용한 능동소음제어 알고리즘에 관한 연구
김현석(H.S.Kim),나희승(H.S.Na),오시환(S.H.Oh),박영진(Y.J.Park) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, we investigate the possibility to combine two active noise control(ANC) schemes, feedforward and feedback. When the source of noise is well identified and measureable, we can use feedforward scheme such as Filtered-X LMS algorithm using this information as reference. If reference is not accessible, we can use feedback scheme. For ANC of automobile, reference signal for feedforward scheme can be vibration of engine, vibration from the road, etc. The other components of noise at low frequency range due to many other noise source can be controlled by feedback scheme. There are merits and demerits for the two schemes, and we propose a ANC structure that has the merits of the two schemes.<br/>